I once found a link at the bottom of a HTML document containing instructions for ordering pizza for the programmer rather than any monetary contributions, apparently people from as far away as Germany had ordered pizza for the coder. If I ever release any of my own code into the wild... trust me it will have just such a comment.

The programmer mentioned by FelonyMPulse is Andrew Tridgell, the originator of Samba, which allows *nix systems to participate in Microsoft's SMB/CIFS networking. Samba is GPL'ed, but Andrew mentioned the pizza thing "as a bit of a joke" even in the earliest documentation. Over the years, he has been the recipient of many well-deserved pizzas. This is no small achievement, since he lives in Canberra, Australia.

2.11 Pizza supply details

Those who have registered in the Samba survey as "Pizza Factory" will
already know this, but the rest may need some help. Andrew doesn't ask
for payment, but he does appreciate it when people give him
pizza. This calls for a little organisation when the pizza donor is
twenty thousand kilometres away, but it has been done.

Ring up your local branch of an international pizza chain
and see if they honour their vouchers internationally. Pizza Hut do,
which is how the entire Canberra Linux Users Group got to eat pizza
one night, courtesy of someone in the US.

Ring up a local pizza shop in Canberra and quote a credit
card number for a certain amount, and tell them that Andrew will be
collecting it (don't forget to tell him.) One kind soul from Germany
did this.

Purchase a pizza voucher from your local pizza shop that has
no international affiliations and send it to Andrew. It is completely
useless but he can hang it on the wall next to the one he already has
from Germany :-)

[Commodore] Essential equipment for
those late-night or early-morning debugging sessions. Mainly used
as sustenance for the hacker. Comes in many decorator colors, such
as Sausage, Pepperoni, and Garbage. See ANSI standard pizza.